Note 7 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Year Ended December 31,
	2018			2017			2016
Stock-based compensation expense, gross	$	6,661		$	8,303		$	5,099
Income tax benefit at our statutory rate associated with stock-based compensation		(1,692	)		(3,238	)		(1,989	)
Stock-based compensation expense, net	$	4,969		$	5,065		$	3,110

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

	Year Ended December 31,
	2018					2017					2016
				Weighted-					Weighted-					Weighted-
				Average					Average					Average
	Number			Grant Date		Number			Grant Date		Number			Grant Date
	of			Fair Value		of			Fair Value		of			Fair Value
	Shares			Per Share		Shares			Per Share		Shares			Per Share
Restricted stock - common:
Outstanding - beginning of period		503,685		$	11.14		396,033		$	12.06		337,506		$	9.57
Granted		391,836			14.63		307,943			10.40		237,500			12.88
Vested		(225,570	)		11.21		(200,291	)		11.82		(178,973	)		8.46
Forfeited		(91,057	)		13.27		-			-		-			-
Outstanding - end of period		578,894		$	13.14		503,685		$	11.14		396,033		$	12.06
Restricted stock - Class A common:
Outstanding - beginning of period		462,632		$	10.63		415,082		$	10.15		374,693		$	9.46
Granted		220,080			12.65		275,076			10.84		218,612			11.25
Vested		(274,926	)		10.48		(227,526	)		10.00		(178,223	)		10.04
Outstanding - end of period		407,786		$	11.82		462,632		$	10.63		415,082		$	10.15
Restricted stock units - common:
Outstanding - beginning of period		209,500		$	15.70		-		$	-
Granted		-			-		215,500			15.70
Vested		(209,500	)	$	15.70		-			-
Forfeited		-			-		(6,000	)		15.70
Outstanding - end of period		-		$	-		209,500		$	15.70